Wiktionary is a collaborative dictionary project from Wikimedia Foundation. Its aim is to describe all words of all languages. On the English Wiktionary, all definitions and descriptions are in English; on other Wiktionaries, these are in the respective languages.

Besides lexical entries, Wiktionary also includes a thesaurus, a rhyme guide, phrase books, language statistics and extensive appendices so that not only a definition, but also information to understand the word—such as etymology and pronunciation—are given.

Community content is available under CC-BY-SA unless otherwise noted.